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Issue 58, 2020
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Engineering zirconium-based UiO-66 for effective chemical conversion of d-xylose to lactic acid in aqueous condition

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Abstract

Utilizing metal–organic frameworks (MOFs) as heterogeneous catalysts is an interesting and important application due to their well-controlled catalytic sites and well-defined porous structures. In this study we apply, for the first time, Zr-based UiO-66 for the catalytic hydrothermal conversion of D-xylose to lactic acid (LA). The reactions are catalyzed by the coordinatively unsaturated Zr4+, as Lewis acid sites, and the hydroxide ion (OH) located at the defect sites. The catalytic performances of UiO-66 catalysts synthesized through a modulator-free approach (UiO-66) and an acetic acid modulator-assisted approach (UiO-66(AA)) are distinct due to the different concentrations of local defects. The UiO-66 catalyst possessing a higher defect concentration exhibits a superior LA yield of 1.17 mol from 1 mol of xylose. However, the UiO-66(AA) catalyst with higher crystallinity shows better selectivity for LA over furfural, a side product from the competitive pathway. The enhanced LA yield and excellent selectivity can be achieved by the removal of AA from UiO-66(AA) resulting in a novel MOF catalyst (UiO-66(AA)*) which provides more accessible catalytic sites with retained crystallinity. This work highlights that the structural engineering of MOF catalysts is crucial for the fine-tuning of their catalytic properties.

Graphical abstract: Engineering zirconium-based UiO-66 for effective chemical conversion of d-xylose to lactic acid in aqueous condition

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Supplementary files

Article information


Submitted
13 May 2020
Accepted
22 Jun 2020
First published
22 Jun 2020

Chem. Commun., 2020,56, 8019-8022
Article type
Communication

Engineering zirconium-based UiO-66 for effective chemical conversion of D-xylose to lactic acid in aqueous condition

P. Ponchai, K. Adpakpang, S. Thongratkaew, K. Chaipojjana, S. Wannapaiboon, S. Siwaipram, K. Faungnawakij and S. Bureekaew, Chem. Commun., 2020, 56, 8019
DOI: 10.1039/D0CC03424J

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